Wach was born June 1, 1939, in Bridgeport; son of Emery F. and Mary Niedzwiedz Wach. He was a lifelong resident of Fairfield. He graduated from Roger Ludlowe High School, Fairfield in 1956. He attended the University of Connecticut. He graduated from Otterbein College in Westerville, Ohio in 1960, where he was a member of Pi Kappa Phi fraternity. He worked 39 years as an instrumentation engineer for Sikorsky Aircraft in Stratford until his retirement in 1999.

Wach is survived by his wife, Angela; daughter, Deborah Mahoney (Dermott) of Fairfield; son, Brian Wach of Shelton; brother-in-law, Richard Renzulli of Fairfield; and several cousins. He was predeceased by his parents.